Blowpipe.



M. E. WINANS.

BLOWPIPE. APPLICATION FILED EEB.11, 1915.

Patented June 22, 1915.

w, Sam mew sod MILTON E. WINANS, 0F NEWARK, NEW JERSEY,

l til l lit ASSIGNOR To oxwnnn ACETYLENE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 015' WEST VIRGIN IA.

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Specification of Letters Patent. Patefltafl June 22, 11915.

Application filed February 11, 1915. Serial No. 7,459.

To all whom it may concern Be it known that I, MILTON E. WINANS,

a citizen of the United'States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Blowpipes, of which the following is a full, clear, and exact description.

The oxy-acetylene blow-pipe has met with marked success as a means for cutting metal, but in at least one field of metal-cutting, namely, cutting off rivet heads on steam boilers and certain other structures where rivets are employed to fasten overlapping plates or members together, it has been used but little, the reason being that as ordinarily constructed the blow-pipe is too wastefulof time and gas; since with none of the prior tools is it possible to remove the rivet head except by burning off the entire head. If the attempt was made to cut off the head close to the plates without burning-the entire head, which requires much time and gas, the plates were-inevitably injured and at least seriously weakened if not rendered wholly useless. I have accordingly been led to devise my present invention, which has for its chief object to provide an improved blow-pipe, by which the operator can prouce a clean cut through a rivet head without injury to the underlying plate.

To this and other ends the invention con sists in the novel features of construction hereinafter described.

tion is illustrated in the accompanying drawing, in which Figure 1 shows the usual type of blowpipe nozzle, and also illustrates the eflect of attempting to use the same for cutting ofl" a rivet head. Fig. 2 shows a portion of my improved rivet-cutting blowpipe in section, and Fig. 3 is an end view. Fig. 4 is a cross section on line H of Fig. 2. Fig. 5 shows the device in use for cutting rivet heads.

In Fig. 1, 10, 11 designates two overlapping metal plates, fastened by a rivet 12. The blowpipe nozzle 13 is of the usual form, itself straight and having straight gas-passages from inlet to outlet. The dotted lines show the shape of the flame produced, and it will readily be seen that if applied to a rivet insuch fashion as to cut off the head and not consume the entire head the plates, or at least the plate 10, will be seriously injured. On the other hand, to burn up the entire head requires about twice as much gas and about twice as much time as would be required to make a clean narrow cut through the headat the surface of the plate. In the preferred form of my improved blowpipe, illustrated in Figs. 2, 3 and 5, the nozzle 14 is flattened rather than circular in cross section, and is bent transversely as shown in Figs. 2 and 5, the end portion, from about the point "15, being preferably straight so as to be capable of lying flat on the plate, as 16, and adjacent to rivet 17, thereby projecting the flame (and the oxygen cutting jet or jets) in a plane parallel to the plate, as clearly indicated in Fig. 5. The nozzle has a central passage 14 into which opens a passage 21 in the head 22 of the blowpipe. Connected with the latter passage is a tube 23 connected at the rear to a supply (not shown) of oxygen under pressure so as to project a jet of oxygen from the nozzle passage 14. Oneach side of the passage 14 is a passage 14*, communicating at the rear end with an annular passage 23 formed in the head 22 around the bore or passage 21. A passage 24 in the head, connected at the rear to sources of oxygen and acetylene not shown, conveys a mixture of these gases to the annular passage, from which it flows through the passages 14 to supply the heating flames at the orifices of the latter. Preferably the passages in the nozzle are so disposed adjacent to their orifices as to project the jets in substantial parallelism. The orifice of the oxygen passage should be small and the passage for some distance back should be of the same cross-section, or otherwise arranged, so that the jet of oxygen projected from the orifice will be thin (in the vertical direction when viewed as in Fig. 2) however wide the jet may be. Preferably. the orifice is circular and the passage is of the same cross-sectional contour and area, thereby giving an oxygen jet which is practically cylindricalin form, with but little spreading in any direction. At the same time, the thickness of the metal below the passages 14 14:", or the spacing of the passages from the lower surface of the nozzle. is so proportioned with respect to the thickness of at least the oxygen jet that when the nozzle is applied to the work. as in Fig. 5, for example, the oxygen jet will hardly do more than graze the plate The nozzle is preferably constructed'so as to fit the torch or blowpipe head intercha'ngeably with other types of nozzles, and forthis purpose is provided with a loose locking nut 19, cooperating .with a shoulder 20, to secure the nozzle properly in place.

The present application is filed in lieu of my prior application Ser. No. 849,683, filed July 8th, 1914, on improvements in nozzles for metalcutting blowpipes.

It is to be understood that the invention is by no means limited to the specific construction illustrated, but can be embodied in other forms without departure from its spirit. While my improvement is of particular i'mportancefor the use described, it is applicable to any projectingpiece where the cut must be as close as possible to an adjoining part, and the description of its use with rivets is intended to be typical only, and not limiting.

What I claim is:

1. In a blowpipe for cutting off the heads of rivets used for fastenin metal plates together, a nozzle having independent passages for oxygen and a combustible mixture, the passages being bent to project the mixture' and the oxygen substantially parallel to the underside of the rivet head, and means for supplying oxygen and a combustible mixture to the respective passages.

2. In a blowpipe for cutting oif the heads of rivets used to fasten metal plates together, a nozzle having-a passage for a mix- -in substantial parallelism with the underside of the rivet-head and in a plane substantially continuous to surface of the adjacent plate, means for supplying oxygen and a combustible gas to the first-named passage, and means for supplying oxygen to the second assage.

3. In a b owpipe for cutting off the heads of rivets used to fasten metal plates together, a nozzle of flattened cross section having independent passages for oxygen and a combustible mixture, bent to project a heating flame and a thin cutting jet of oxygen in substantial parallelism with the under surface of the nozzle adjacent to the orifices of said passages, and means for supplying oxygen and a mixture of oxygen and a combustible gas to the respective passages.

4. In a blowpipe for cutting off the heads of rivets used to fasten -metal plates together, a thin and relatively wide nozzle bent transversely and having inde endent longitudinal passages for oxygen an a combustible mixture, the oxygen and mixture passages being separate from each other from end to end of the nozzle and arranged at their rear ends for connection with independent passages in a blowpipe head, and means for removably attaching the nozzle to a blowpipe head.

In testimony whereof I affix my signature in the presence of two subscribing witnesses.

MILTON E. WINANS.

Witnesses:

A. GAMMARATO, BENJ. B. BEACH. 

